LogNormal

log-normal function: an asymmetric bump, fast rise then long-tailed decay.

Many physical quantities (particle sizes, income, reaction times) are not normal but log-normal. Here Center maps to the log-mean mu and Scale maps to the log-standard-deviation sigma: shape(u) = exp(-(ln((x-Center)) - mu)^2 / (2 sigma^2)) / ((x-Center) sigma sqrt(2π)). Returns 0 for x <= Center to keep the domain valid.